Heat olive oil in a large frying pan over medium heat. Add the onions, sprinkle with 1/4 t. salt, and stir. Cover, turn the heat down to low, and cook for 30 minutes, stirring from time to time, until onions are soft and translucent. Remove the lid, turn heat to med. high, and cook for another 5 minutes, stirring, until most of the liquids have evaporated.

Remove the dough from the refrigerator and let stand at room temperature for 10 minutes before using. Preheat the oven to 180 degrees Celsius. Grease a 25 cm quiche pan. Roll out the dough and transfer to the pan; prick all over with a fork. Bake for 7 minutes, until lightly golden, and remove from oven.

Remove onions from the pan and fry up the lardons until crisp.

In a medium mixing bowl, whisk together the eggs and cream. Season with remaining salt and pepper. Fold in the cheese, onions, and lardons, and pour into the tart shell.

Bake for 35 minutes, until the top is golden and the center of the quiche is still slightly jiggly. Turn off the oven and leave the quiche in the closed oven for 10 minutes, until the filling is set. Serve warm.

Place the pork in a large pot, cover with cold water, and bring to a boil. Drain, rinse, and cover with fresh cold water. Add 3 branches parsley, peppercorns, bouquet garni, and bouillon cubes. Bring to a boil, then reduce heat to a simmer. Cover and simmer for 45 minutes.

Peel the carrots and cut carrots into discs. Cut potatoes into cubes. Slice the celery. Add the vegetables to the pot and cook 20 minutes after it returns to a boil. Drain, reserving 30 cl. of the cooking liquid.

Cube pork, removing any remaining fat. Place pork and vegetables in a large gratin dish.

Prepare the cheese sauce: melt the butter in a saucepan, then add flour, whisking vigorously, and cook for 1 minute. Gradually add the reserved cooking liquid and milk to the pan, whisking constantly. Bring to a boil while stirring, and let simmer 2-3 minutes, until it thickens. Add 3/4 of the cheese; salt and pepper to taste.

Preheat the oven to 180 degrees Celsius. Pour the sauce over the pork and vegetables, then sprinkle with the remaining cheese. Bake 30 minutes. Sprinkle with minced parsley and serve immediately.

Mix flour, butter and salt together gently with fingertips in a small bowl. Incorporate 3 T. water. Gather dough together in a ball, wrap in plastic and chill for 30 minutes.

Clean and slice leeks, then sauté in butter for 15 minutes, over low heat. Rinse spinach. Place in a saucepan and salt. Cook for 3-4 minutes over low heat. Drain and coarsely chop. Add to leeks and cook another 3 minutes. Salt and pepper and let cool.

Preheat the oven to 400 degrees. Roll out the pastry dough and place in a 12" tart or quiche pan. Poke with a fork and then add spinach/leek mixture.

In a bowl, mix the eggs with a fork and add the creme and cheese. Salt and pepper. Pour mixture over vegetables and bake for 30 minutes, reducing the temperature to 375 degrees after 15 minutes.